The best answer I can give you today is that we don't know (which at this point would mean no). We have not done a lot of performance work so far, but will do so before v 1.0, which is scheduled for January 2011. Also, the answer to that depends on how much
you do on Orchard, whether you handle everything through it or do more custom stuff. I'd encourage you to do your own evaluation based on your own performance objectives once we have done this work. We would be very interested to hear and use any feedback
you may have in this area, and to try to improve things on targeted scenarios.